I had a similiar experience after the c-section birth of my second child. My husband actually called me a 'bear trap' down there. Having sex not only did not feel good to me but also to him. In addition, my doctor could not reach far enough to do a proper pap smear. My doctor explain that with all the pulling and tugging, your body parts down there are moved around, sometimes not in the 'right' way.
I would not be surprised to find out that you do have something stuck down there.
The good news is that things can be fixed. Amazingly enough, we braved having sex and surprizingly got pregnant with a third baby. After having a third c-section I knew that I could end up more messed up than even before. But just the opposite happened. All is fixed! We are know going to have to be very careful to not have number 4!
I wish you luck finding a doctor willing to help you. Don't give up!